---
id: python-class-self-parameter
title: "Python Class Self Parameter"
category: "Programming_Language"
status: "draft"
verification_status: "conceptual"
canonical_id: ""
aliases: ["self parameter", "파이썬 self"]
duplicate_of: ""
source_trust_level: "B"
confidence_score: 0.9
created_at: 2026-07-04
updated_at: 2026-07-04
review_reason: ""
merge_history: []
tags: ["python", "programming", "w3schools", "self"]
raw_sources: ["https://www.w3schools.com/python/python_class_self.asp"]
applied_in: []
github_commit: ""
---

# [[Python Class Self Parameter]]

## 🎯 한 줄 통찰 (One-line insight)
`self` isn't a reserved keyword — it can legally be renamed to anything — but it must always be the first parameter of every method, and renaming it away from the "self" convention actively hurts readability for other developers. [S1]

## 🧠 핵심 개념 (Core concepts)
- **`self`** — a reference to the current instance of the class; used to access its properties/methods. [S1]
- **Must be first parameter** — every method in a class needs it as the first parameter. [S1]
- **Not a reserved word** — can be renamed (e.g. `myobject`, `abc`), but convention strongly favors keeping `self`. [S1]
- **Distinguishes instances** — without self, Python couldn't tell which object's properties a method should operate on. [S1]
- **Calling one method from another** — `self.greet()` inside another method of the same class. [S1]

## 🧩 추출된 패턴 (Extracted patterns)
- **Two different objects, same method, different data** — `p1.printname()` and `p2.printname()` both call the same method definition, but `self` resolves to a different object each time, producing different output. [S1]

## 📖 세부 내용 (Details)
- Basic self usage: `class Person: def __init__(self, name, age): self.name = name; self.age = age; def greet(self): print("Hello, my name is " + self.name)`. [S1]
- Renamed (legal but discouraged): `def __init__(myobject, name, age): myobject.name = name`. [S1]
- Calling another method via self: `def welcome(self): message = self.greet(); print(message + "!")`. [S1]

## ⚖️ 모순 및 업데이트 (Contradictions & updates)
소스에서 모순되는 정보는 발견되지 않음. "self"라는 이름 자체는 관례일 뿐 강제되지 않는다는 점이 명시적으로 언급됨. [S1]

## 🛠️ 적용 사례 (Applied in summary)
현재 발견된 실제 적용 사례가 없습니다 — 클래스 메서드 전체에서 반복적으로 사용되는 필수 첫 매개변수다. [S1]

## 💻 코드 패턴 (Code patterns)
Calling one method from another via self (Python):
```python
class Person:
    def __init__(self, name):
        self.name = name
    def greet(self):
        return "Hello, " + self.name
    def welcome(self):
        message = self.greet()
        print(message + "! Welcome to our website.")
```

## ✅ 검증 상태 및 신뢰도
- **상태:** draft
- **검증 단계:** conceptual
- **출처 신뢰도:** B (W3Schools — widely used educational reference, not a primary standards body)
- **신뢰 점수:** 0.90
- **중복 검사 결과:** 신규 생성 (New discovery)

## 🔗 지식 그래프 (Knowledge Graph)
- **상위/루트:** [[Python Tutorial]]
- **관련 개념:** [[Python Class Init Method]], [[Python Class Properties]], [[Python Class Methods]]
- **참조 맥락:** 모든 클래스 메서드의 첫 매개변수 관례 — 인스턴스별 데이터 접근의 핵심.

## 📚 출처 (Sources)
- [S1] W3Schools — Python self Parameter — https://www.w3schools.com/python/python_class_self.asp

## 📝 변경 이력 (Change history)
- 2026-07-04: Initial draft synthesized from the W3Schools "Python self Parameter" page (Astra wiki-curation, P-Reinforce v3.1 format).